[FFmpeg-devel] [PATCH] libavutil: AVEncodeInfo data structures
Nicolas George
george at nsup.org
Sat Aug 10 00:54:48 EEST 2019
Juan De León (12019-08-09):
> AVEncodeInfoFrame data structure to store as AVFrameSideData of type
> AV_FRAME_DATA_ENCODE_INFO.
> The structure stores quantization index for each plane, DC/AC deltas
> for luma and chroma planes, and an array of AVEncodeInfoBlock type
> denoting position, size, and delta quantizer for each block in the
> frame.
> Can be extended to support extraction of other block information.
>
> Signed-off-by: Juan De León <juandl at google.com>
> ---
> libavutil/Makefile | 2 +
> libavutil/encode_info.c | 68 +++++++++++++++++++++++++++++++
> libavutil/encode_info.h | 90 +++++++++++++++++++++++++++++++++++++++++
> libavutil/frame.c | 1 +
> libavutil/frame.h | 7 ++++
> 5 files changed, 168 insertions(+)
> create mode 100644 libavutil/encode_info.c
> create mode 100644 libavutil/encode_info.h
>
> diff --git a/libavutil/Makefile b/libavutil/Makefile
> index 57e6e3d7e8..37cfb099e9 100644
> --- a/libavutil/Makefile
> +++ b/libavutil/Makefile
> @@ -24,6 +24,7 @@ HEADERS = adler32.h \
> dict.h \
> display.h \
> downmix_info.h \
> + encode_info.h \
> encryption_info.h \
> error.h \
> eval.h \
> @@ -111,6 +112,7 @@ OBJS = adler32.o \
> dict.o \
> display.o \
> downmix_info.o \
> + encode_info.o \
> encryption_info.o \
> error.o \
> eval.o \
> diff --git a/libavutil/encode_info.c b/libavutil/encode_info.c
> new file mode 100644
> index 0000000000..6d832b2e36
> --- /dev/null
> +++ b/libavutil/encode_info.c
> @@ -0,0 +1,68 @@
> +/*
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#include "libavutil/encode_info.h"
> +#include "libavutil/mem.h"
> +
> +static int init_encode_info_data(AVEncodeInfoFrame *ptr, int nb_blocks) {
> + ptr->nb_blocks = nb_blocks;
> + ptr->dc_q = ptr->ac_q = -1;
> + ptr->dc_chroma_q = ptr->ac_chroma_q = -1;
> +
> + for(int i=0;i<AV_NUM_DATA_POINTERS;i++)
> + ptr->plane_q[i] = -1;
> +
> + return 0;
> +}
> +
> +AVEncodeInfoFrame *av_encode_info_alloc(int nb_blocks)
> +{
> + AVEncodeInfoFrame *ptr;
> + //AVEncodeInfoFrame already allocates size for one element of AVEncodeInfoBlock
> + size_t size = sizeof(AVEncodeInfoFrame) + sizeof(AVEncodeInfoBlock)*FFMIN(nb_blocks-1, 0);
> +
> + if (nb_blocks < 0 || size >= INT_MAX)
> + return NULL;
> +
> + ptr = av_mallocz(size);
> + if (!ptr)
> + return NULL;
> +
> + init_encode_info_data(ptr, nb_blocks);
> +
> + return ptr;
> +}
> +
> +AVEncodeInfoFrame *av_encode_info_create_side_data(AVFrame *frame, int nb_blocks)
> +{
> + size_t size = sizeof(AVEncodeInfoFrame) + sizeof(AVEncodeInfoBlock)*FFMIN(nb_blocks-1, 0);
> +
> + if (nb_blocks < 0 || size >= INT_MAX)
> + return NULL;
> +
> + AVFrameSideData *sd = av_frame_new_side_data(frame,
> + AV_FRAME_DATA_ENCODE_INFO,
> + size);
> + if (!sd)
> + return NULL;
> +
> + memset(sd->data, 0, size);
> + init_encode_info_data((AVEncodeInfoFrame*)sd->data, nb_blocks);
> +
> + return (AVEncodeInfoFrame*)sd->data;
> +}
> diff --git a/libavutil/encode_info.h b/libavutil/encode_info.h
> new file mode 100644
> index 0000000000..f4175b43c9
> --- /dev/null
> +++ b/libavutil/encode_info.h
> @@ -0,0 +1,90 @@
> +/*
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#ifndef AVUTIL_ENCODE_INFO_H
> +#define AVUTIL_ENCODE_INFO_H
> +
> +#include "libavutil/frame.h"
> +
> +/**
> + * Data structure for extracting block data stored in an array in AVEncodeInfoFrame
> + */
> +typedef struct AVEncodeInfoBlock{
> + /**
> + * Distance in luma pixels from the top-left corner of the visible frame
> + * to the top-left corner of the block.
> + * Can be negative if top/right padding is present on the coded frame.
> + */
> + int src_x, src_y;
> + /**
> + * Width and height of the block in luma pixels
> + */
> + int w, h;
> + /**
> + * Delta quantization index for the block
> + */
> + int delta_q;
> +
> + uint8_t reserved[128];
What are these (this one and the one below) reserved fields for?
> +} AVEncodeInfoBlock;
> +
> +/**
> + * Frame encoding info, used as AVFrameSideData
> + */
> +typedef struct AVEncodeInfoFrame {
> + /**
> + * Number of blocks in the array
> + */
> + int nb_blocks;
> + /**
> + * Base plane quantizer for the frame, set to -1 when value is unsupported
> + */
> + int plane_q[AV_NUM_DATA_POINTERS];
> + /**
> + * DC/AC quantizer index delta, set to -1 when value is value unsupported.
> + */
> + int ac_q, dc_q;
> + /**
> + * DC/AC chroma quantizer index delta, set to -1 when value is value unsupported.
> + */
> + int ac_chroma_q, dc_chroma_q;
> +
> + uint8_t reserved[256];
> + /**
> + * Dynamically allocated memory, set to [1] for C++ compatibility
> + * The array has at least one element up to nb_blocks
> + */
> + AVEncodeInfoBlock blocks[1];
> +} AVEncodeInfoFrame;
> +
> +/**
> + * Allocates memory for AVEncodeInfoFrame plus an array of
> + * {@code nb_blocks} AVEncodeInfoBlock and initializes the variables.
> + * Can be freed with a normal av_free() call.
> + */
> +AVEncodeInfoFrame *av_encode_info_alloc(int nb_blocks);
> +
> +/**
> + * Allocates memory for AVEncodeInfoFrame plus an array of
> + * {@code nb_blocks} AVEncodeInfoBlock in the given AVFrame {@code frame}
> + * as AVFrameSideData of type AV_FRAME_DATA_ENCODE_INFO
> + * and initializes the variables
> + */
> +AVEncodeInfoFrame *av_encode_info_create_side_data(AVFrame *frame, int nb_blocks);
> +
> +#endif /* AVUTIL_ENCODE_INFO_H */
> diff --git a/libavutil/frame.c b/libavutil/frame.c
> index dcf1fc3d17..65c25e6cd7 100644
> --- a/libavutil/frame.c
> +++ b/libavutil/frame.c
> @@ -842,6 +842,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type)
> #endif
> case AV_FRAME_DATA_DYNAMIC_HDR_PLUS: return "HDR Dynamic Metadata SMPTE2094-40 (HDR10+)";
> case AV_FRAME_DATA_REGIONS_OF_INTEREST: return "Regions Of Interest";
> + case AV_FRAME_DATA_ENCODE_INFO: return "AVEncodeInfo";
> }
> return NULL;
> }
> diff --git a/libavutil/frame.h b/libavutil/frame.h
> index 5d3231e7bb..ec112c5d15 100644
> --- a/libavutil/frame.h
> +++ b/libavutil/frame.h
> @@ -179,6 +179,13 @@ enum AVFrameSideDataType {
> * array element is implied by AVFrameSideData.size / AVRegionOfInterest.self_size.
> */
> AV_FRAME_DATA_REGIONS_OF_INTEREST,
> + /**
> + * Extract frame and block encode info from supported decoders. The data
> + * stored is an AVEncodeInfoFrame type, which contains an array of
> + * AVEncodeInfoBlock. Described in libavuitls/encode_info.h
> + * Can be allocated in the frame directly with av_encode_info_create_side_data().
> + */
> + AV_FRAME_DATA_ENCODE_INFO,
> };
>
> enum AVActiveFormatDescription {
Regards,
--
Nicolas George
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